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Old April 22nd, 2014, 01:03 PM   #1
fsumotorhead
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Default Leveling High Spot in Floor???

A little background info on what Iím dealing with:


I bought this house a year and a half ago and when I moved in the kitchen floor was fine, typical ceramic tile. Since then the tile has been falling apart, some tiles crack and others pop right up out of the thin-set. So after deciding it was beyond repair, I decided to rip it out and replace it with laminate floor that has a tile pattern.


I found spots where there was zero thin-set and other spots where it was almost an inch thick, and there were also no expansion joints of any kind, so that explains why it buckled and the tiles were popping off.

I pulled all the tiles, backer board and screw out and discovered nice hardwood ply wood underneath. The plywood is on top of OSB, Iím assuming the OSB is ĺ and the plywood is ľ, but donít know for certain. The plywood is held down with staples every 6 inches or so, and generally seems very solid.

Current Problem at Hand:


Before installing my new floor I checked the flatness and other than one spot found it to be pretty flat. The bad part is that one spot is a high spot and seems to be in the ľĒ + category. Iím not sure the reason for the high spot, but the spot runs almost the entire length of the sheet, in the pic itís where my yellow straight edge is.


I can jump up and down on the high spot and canít detect any flex or wiggle. I noticed all the joints are extremely tight and covered with floor leveler, would this cause the sheet(s) to buckle? I read on some website that running a circular saw blade between sheets may create enough of an expansion joint, thoughts???


Can I sand down the plywood enough or will it delaminate if I remove that much?

What are my options? I need to have this project wrapped up by Sunday so my wife's daycare can reopen next week?








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Old April 22nd, 2014, 01:14 PM   #2
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How are the floor joists? Swelled or anything? A support in the basement that needs to be adjusted? If that is the sub floor, Sanding the high spot down might weaken it.
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Old April 22nd, 2014, 01:36 PM   #3
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just raise the rest of the floor.......duh. But what is under the high spot in the basement. is it on a joist or anything?
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Old April 22nd, 2014, 02:15 PM   #4
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Is that parallel or perpendicular to the direction of the floor joists?

Need to determine if you have one bowed/raised joist that is right under your yellow line, or if your subfloor/underlayment is buckled.


Can you access the floor joist from below? You could set up a level reference (a 4ft level setting dead level would work fine, and measure upwards to the tops of the joists to see if it seems like 1 is high. If it is, I'd remove the underlayment, plane that one down a bit and re-assemble.

If the floor is buckled, as you said, you can make a relief cut, then just fill it with something to keep the new vinyl floor from showing the relief cut. the vinyl tends to show most things below it once all the air vacuums out over a couple weeks. Better grade vinyls seem to have thicker backings and hide imperfections better.

You could also just rent a drum sander and sand it down. If its delaminating, you can also put some sealer or go a little below level, then add floor leveling compount and relevel and sand it (lol, basically bondo it..)
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Old April 22nd, 2014, 02:34 PM   #5
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The high spot does run parallel to the joists.

The joists are exposed as the basement isn't finished. But I'll have to check the measurements and see if it is above a joist and/or if a joist is high, though my high spot only runs about 6ft, not the length of the kitchen.

The plywood is not the sub floor it's only 1/4" thick, there is OSB under it. I have been thinking about a relief cut and fill approach, but need to do a bit more research.
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Old April 22nd, 2014, 02:39 PM   #6
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Pull the board and replace? Or don't you want to break up the floor leveler.
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Old April 22nd, 2014, 03:06 PM   #7
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Quote:
Originally Posted by mtnbikinbryno View Post
Pull the board and replace? Or don't you want to break up the floor leveler.
I'm willing to do what's necessary to fix the floor properly, just not sure what the best method is yet.

If the plywood is just heaved, I'll pull it out and replace. If it's a joist that's higher than the rest, well then it get's more complicated.

Hopefully I can figure this out easy enough later tonight.
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Old April 22nd, 2014, 03:19 PM   #8
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you can not determine how to fix the problem properly until you determine what the cause of the problem is
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Old April 22nd, 2014, 03:59 PM   #9
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So, under the high spot, run a level under that joist spanning the one on either side or tow. Adjust it with some shims to be level if needed. Measure up from that, preferably with a hard steel ruler instead of a tape.

If its high, then id remove the top plywood, and cut out enough subfloor to expose the high section of joist. Likely 32" wide to span 1 joist in either direction. Then level it with a planer or sander, and reassemble.

1/4" ply underlayment on top would flex if you had anothet 1/4"+ gap under it. So the problem is likely the subfloor or joist. If your subfloor is buckled, you should be able to see that from inspecting in the basementt.
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Old April 22nd, 2014, 04:02 PM   #10
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Quote:
Originally Posted by kickstand View Post
you can not determine how to fix the problem properly until you determine what the cause of the problem is
:Thumb: could probably find the issue in less time than it takes to post pics on the web. Theres only 3 pieces of wood involved.
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Old April 22nd, 2014, 04:03 PM   #11
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Lazy option: run a 2" hole saw through the center of the hump and take a peek at the cross section. Then patch then repair is determined.
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Old April 22nd, 2014, 05:26 PM   #12
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Quote:
Originally Posted by Haggar View Post
So, under the high spot, run a level under that joist spanning the one on either side or tow. Adjust it with some shims to be level if needed. Measure up from that, preferably with a hard steel ruler instead of a tape.

If its high, then id remove the top plywood, and cut out enough subfloor to expose the high section of joist. Likely 32" wide to span 1 joist in either direction. Then level it with a planer or sander, and reassemble.

1/4" ply underlayment on top would flex if you had anothet 1/4"+ gap under it. So the problem is likely the subfloor or joist. If your subfloor is buckled, you should be able to see that from inspecting in the basementt.
This.
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